Improvement in wire-lmattress frames



G. V. & W. l. BUNKER.

Wire Mattress Frames..

N0 145,553' Patented Dec .16,1873.

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UNITED STATES PATENT OFFICE,

" GEORGE V. BUNKER AND WILLIAM I. BUNKER, OF YANKTON, DAKOTA TER.

IMPROVEMENT IN WIRE-MATTRESS FRAMES.

Specification forming part of Letters Patent No. 145,553, dated Drcember16, 1873; application filed April 28, 1873.

To all whom it may concern:

Be it known. that we, GEORGE V. BUNKER and'l/VILLIAM I. BUNKER, ofYankton, county of Yankton and Territory of Dakota, have invented a newand useful Improvement in WVoyen-Wire-Mattress Frames, of which thefollowing is a specification:

The object of our invention is to provide woven -wire mattresses with acheap and durable frame, so arranged that they can be stretched to anyrequired tension.

The frame is composed of two side rails, one of which is shown at a inthe drawing; two end rails, b 1); two set-screws, one of which is shownat c, and a cross-piece, the end of which is shown at m. At one end ofthe frame the end rail 12 is firmly bolted to the side rails, while theother end rail b, at the other end of the frame, is bolted to thecross-piece m, thus enabling it to slide freely on the side rails, whenpressed out by the action of the setscrews 0 0, which are small bars ofiron, at

one end bent at right angles and driven into the side rails, while onthe other end a screw is cut some four or five inches in length,provided with nuts and washers, which act upon the end rail.

When it is necessary to stretch the mattress, the nuts on the screws 0 care'screwed up, thus moving out the end rail b, stretching the mattressd d.

What we claim as our invention, and wish to secure by Letters Patent, isas follows:

A frame composed of two side rails, a a, two end rails, b b, onecross-piece, m, and two set-screws, c o, for the purpose of stretchingwoven-wire mattresses, substantially as described, and for the purposesset forth.

GEORGE v. BUNKER. n 8.] WILLIAM I. BUNKER. [L s.]

Witnesses:

J. H. HASKELL, W. G. PREss.

